Agitating mechanism



Feb; 23, 1943. G. w, BEHNKE ETAL 2,311,814

.AGITATING 'MECHANISM Filed Junev 7, 1940 2 sheets-sheet 1 Feb. 23, 943.Q w, BEHNKE ETAL Y12,31L8l1- AGITATING MECHANISM Filed June '7, 1940 2Sheets-Sheet 2 Patented Feb. 23, 1943 AGITATING MECHANISM George W.Behnke, Russell G. Westcott, and John Sandula, Durand, Mich., assignorsto Simplicity Engineering Company, Durand, Mich., a corporation ofMichigan Application June 7, 1940, serial No. 339,370

3 Claims.

This invention relates to agitating mechanism for use with screening andconveying machines having an eccentric gyratory action, as well asso-called vibrating machines provided with an eccentric out-of-balanceaction.

One of the prime objects of the invention is to provide a very simple,practical, and economical machine for intensifying the pulsating actioncreated by the gyratory throw, such as is customary in screening andconveying equipment of this nature.

Another object is to provide means for uniformly conveying the material,simultaneously with the intensifying of the pulsating action.

A further object is to provide a mechanism Which eliminates so-calledblind areas or spots in the screens and which jars the screen to`stratify the material, that is, to force and throw the coarser particlesaway from the surface of the screen to avoid any blocking of the screenmeshes, so that the liner particles readily work their way downwardlyand through the screen.

A further object still is to design a vibrating f mechanism which can beapplied to screening and conveying equipment already in use, as well asto new machines in the process of manufacture.

A still further object is to design a simple and practical vibratingmechanism which can be economically manufactured, readily assembled, andwhich can be easily mounted in position on the screen or conveyer.

With the above and other objects in view, which will appear as thedescription proceeds, the invention resides in the novel construction,combination, and arrangement of parts, substantially as hereinafterdescribed, and more particularly defined in the appended claims, itbeing vunderstood that such changes in the precise embodiment of theherein described invention may be made as come within the scope of theclaims.

In the accompanying drawings is illustrated one complete example of thephysical embodiment of the present invention constructed to the bestmode so far devised for the practical application of the principlesthereof.

Fig. 1 is a longitudinal sectional view through a conventional type ofgyratory screen equipped with an auxiliary vibrating mechanism designedin accordance with one form of the present invention.

Fig. 2 is a top plan view thereof.

Fig. 3 is a transverse sectional View through a. conventional type ofgyratory screen illustratconnection With a conventional type of gyratingscreen, and while in the present instance we have shown a screen ofconventional design, it will be clearly understood that it is equallyapplicable to various other types of machines and vibratory screensactuated by eccentrics, overbalanced pulleys, hammers, or othermechanical devices with out departing from the principles. Referring nowmore particularly to the accompanying drawings, the numeral 8 indicatesa base comprising longitudinally disposed beams or channel members 9which are mounted on a suitable foundation designed to position thefraine at substantially the angle desired.

Bearing members I0 are mounted on these beams 9 in position as shown,and the turned ends lI of an eccentric shaft I2 are journaled in thesebearings.

The screen body or live screen frame B of the machine may be of any wellknown construction,

and in the present instance, we have shown av pair of spaced apart sideplates l3-l3 provided with openings I4 adapted to accommodate theflanged ends I5 of a tubular member I6, to which is welded or otherwisesecured the ends of the tubular housing I1. Bearing assemblies I8 aremounted in the ends of the tubular shell I6 and the turned ends I9 ofthe counterbalanced eccentric shaft I2 are journaled in these bearings,the extreme ends Il of said shaft being journaled in the main bearingsI0, so that the entire assembly is enclosed in a tight, dustproof shell.

Angles 20 are riveted or otherwise secured to the inner side walls ofthe side plates I3 and crown bars 2| are secured to said angles asshown, the screen cloth 22 being stretched over said crown bars and issecured in position in any desired manner to provide a tight screeningsurface.

In the heavy duty type of apparatus to which this invention relates, itis necessary to employ resilient means acting upon the opposite ends ofthe live screen frame for yieldingly resisting movement thereof out ofits normally balanced state and for maintaining it in proper screeningposition, irrespective of the load distribution and without in any wayinterfering with the gyratory movement of the live frame, and wetherefore provide angular-shaped brackets 23 which are secured to thebeams 3.

Similar brackets 24 are secured to the side plates I3 and resilientmembers 25 are interposed between these brackets to provide a resilientconnection, and we do not deem it necessary to describe this in detail,as it forms no part of the present invention.

It is usual practice to set the frame ci the machine at a predeterminedangle, and a drive pulley 28 is provided on the one end of the shaft l2and is then geared to a motor (not shown) or any other suitable sourceof power and as the material to be screened is fed onto the upper end ofthe screen deck, the gyrating action will screen the materialaccordingly.

The vibrating mechanism can be attached or inbuilt in the unit asdesired, it is generally indicated at D and comprises an enclosedhousing 2l which is provided with spaced apart angular-shaped clips 28secured thereto, and which are in turn secured to the crown bar 2l bywelding or any other means, an opening 29 is provided in the side wallof the housing, and a plug member 30 forms a closure for said opening.

A block or weight 3| is mounted in this housing 21 and spring seats 32are provided therein, adjusting screws 33 being threaded in the lowerwall of the housing, and a spring cup 34 is provided on the end of eachscrew; springs 35 being interposed between the spring seats and the cupsso that the block 3| is resiliently supported, lock nuts 36 beingprovided on each screw to hold the screws in adjusted position, and arubber or bre strip 31 is secured to the top of the weight to eliminatenoise and metal to metal wear.

When the vibration mechanism is mounted on or hung from the crown barsas clearly shown in Figs. 1 and 3 or" the drawings, we find it practicalto use one unit on a screen approximately two feet in width, two on athree foot screen, and three on a four foot screen; and when the unit isattached to the side plates, we iind it desirable to place one unitunder each end of each crown bar.

When the device is used for screening, the :action will be perpendicularto the now of the material or deck of the screen, and just at the momentwhen the screen reaches the maximum high point of its travel, the blockor weight is thrown against the top of the housing, thus creating asudden jar which causes the materials to be thrown clear of the screencloth and loosen lany coarse particles which might block or hang in thescreen openings, thus eliminating any blinding, and in fact, stratifyingthe material.

The device has been found particularly advantageous and effective whenthe screen deck is set in a horizontal position. Where previously it wasnecessary for the discharge end of the screen to be somewhat lower thanthe feed point, because of the diierence in screenability of thematerials to be screened, due to the character, size, shape, andmoisture content, it has been found advantageous to vary the intensityof the action created by the device to suit the product being screened,and this is accomplished by means of the adjusting screws 33, so thatthe spring compression may be increased or decreased accordingly.

When the mechanism is used for conveying, the unit must be placed at anangle varying from 0 to 90 in respect to the ow of material or screendeck surface, the unit being so placed that the impulse is directedtoward the discharge end of the screen which tends to increase therapidity of flow. This makes it possible to convey materials from 0 to15 pitched toward the feed end of the screen, and we find itadvantageous if the surface upon which the material is to be conveyed isconstructed with a concave cross section in order that the materialremain in contact formation to obtain the best results.

In Fig. 6 of the drawings we have shown a force diagram showing thegyratory movement and the position of the weight or block at equallyspaced points in the path of movement of the gyration.

In the present instance, the screen operating mechanism employs aneccentric motion including adjustably mounted spring pressed blockswhich are cooperatively related to vary the intensity oi the pulsationsas the mechanism is operated, `and when the mechanism is in position asindicated at l, the weight or block will be positoned against the top ofthe housing 26 and be held in this position by means of the springs 35.When the eccentric motion causes the block to approach positionindicated at 2, the effective forces increase in a vertical direction sothat the force will be greater than the sum of the inertia of the weightand the spring modulus. thus compressing the spring.

The magnitude of the spring force changes with each position of theeccentric and as the eccentric approaches the position 3, the effectiveforce decreases in a vertical direction to Zero at the position 3, andis then acting in a horizontal direction, thus tending to move the blockhorizontally in the housing. At position 3 with the effective iorce atZero in a vertical direction, the spring overcomes the inertia of theblock, causing it to strike the top of the housing and create theimpulse, then as the eccentric approaches position il, the effectiveforce increases in a vertical direction, and, due to the direction orrotation, causes the block to exert greater pressure against the top ofthe housing. The force exerted against the top of the housing atposition 4 is equal to the sum of the vertical force and the pressure ofthe spring. This completes the cycle which is continuously repeated asthe machine is driven.

What We claim is:

l. In a vibratory screen including a driven vibratory frame includingtransversely disposed crown bars, a screening medium stretched over saidbars, housings rigidly mounted on said bars in predetermined spacedrelation, spring cups adjustably mounted in said housing, a weight ineach housing, springs interposed between said cups `and said weight andnormally forcing the Weight against the upper wall of the housing Whenthe screen is not in operation, a resilient strip on the upper face ofthe weight, said weight receiving its impetus from the movement of saidvibratory frame for obtaining impact of the weight against the upperwall oi the housing on the upward cycle of movement of the screen frame.

2. In a vibrating screen including a gyratory frame includingtransversely disposed crown bars, a screening medium stretched thereoversaid bars, closed housings rigidly mounted on said frame in spacedrelation, vertically adjustable, spaced spring cups provided in eachhousing, a Weight mounted in each housing and having spring receivingapertures provided therein, springs mounted in said apertures and springcups respectively, means for driving said frame, said Weights beingactuated by the vibrating motion of the frame for intensifying thepulsating action of said gyratory frame.

3. In a vibrating screen including a driven vibratory frame, a removablescreen frame carried by the vibratory frame and including transverselydisposed crown bars, a screen stretched thereover, housings rigidlyattached to said crown bars in predetermined relation, spaced apart,spring seats in each housing, manually loperable means for verticallyadjusting said seats, springs mounted in ysaid seats, a weight mountedon said springs and bearing against .the upper Wall of the housing Whenthe screen is not in operation, a resilient strip mounted on the uppersurface of each weight, said weights receiving their impetus from thevibratory action of the vibratory frame and striking directly againstthe upper Wall of the housing when the machine is in operation.

GEORGE W. BEHNKE. RUSSELL. G. WESII'COTT. JOHN SANDULA.

